Amazing team you got here Somalia, if it wasn't for that RMT thats got like 100 likes I'm positive you would be getting a lot more rates. Anyway, on replacing DNite, there is a Salamence set i like to use that breaks stall and also works as a sweeper. its a small variation on Mixmence with some twists that add some suprise factor. Or you could wait for BW2 tutors and Superpower DNite. Or alternatively ScarfMence kills both Latios and Rotom-W with ease so he's worth a try as well. But of note, Dragonites ExtremeSpeed is your only priority attack so removing it can leave you vulnerable to Special Set up sweepers that Sableye cant handle. Volcarona with 1 Quiver Dance and HP ground would be a real bummer for your team to face without Extremespeed.
GL with the team!